For AI assistants and developers

CMBS data as an API and an MCP server

Ask Claude, ChatGPT or another assistant what CMBS lenders are charging, who is lending, how much a property can borrow, or what happens after a missed payment, and it can answer from the same SEC loan data and servicing agreement this site uses, with the date and source on every answer. The same data is a plain JSON API. Free, read-only, no key.

Add it to your AI assistant

Server URL (Streamable HTTP, no key, read-only):

https://cmbs.loan/mcp

Claude (claude.ai and the desktop app): Settings, then Connectors, then Add custom connector. Paste the URL and save. No sign-in is needed.
ChatGPT: Settings, then Apps and Connectors. Turn on Developer mode under Advanced, choose Create, paste the URL and set authentication to none.
Grok: grok.com, then Connectors, then New connector, then Custom. Paste the URL.
Perplexity: Settings, then Connectors, then Add custom connector, then MCP. Paste the URL and choose no authentication.
Mistral Le Chat: Intelligence, then Connectors, then Add connector, then Custom MCP connector. Paste the URL.

Claude Code:

claude mcp add --transport http cmbs-loan https://cmbs.loan/mcp

Cursor (~/.cursor/mcp.json) and other clients that read mcpServers:

{
  "mcpServers": {
    "cmbs-loan": {
      "url": "https://cmbs.loan/mcp"
    }
  }
}

VS Code (.vscode/mcp.json):

{
  "servers": {
    "cmbs-loan": {
      "type": "http",
      "url": "https://cmbs.loan/mcp"
    }
  }
}

Gemini CLI (~/.gemini/settings.json):

{
  "mcpServers": {
    "cmbs-loan": {
      "httpUrl": "https://cmbs.loan/mcp"
    }
  }
}

Menu names change as the apps update. If a step has moved, look for "connectors" or "MCP" in the app's settings.

Tools

Tool	What it returns	Try asking
`get_cmbs_rates`	Median CMBS note rates over the last 90 days, 180 days and 12 months, overall or by property type, with loan counts and the 5- vs 10-year split.	What are CMBS rates on self-storage right now?
`get_cmbs_underwriting`	What CMBS lenders underwrote in the last 12 months: loan size, loan to value, debt service coverage, debt yield, occupancy, interest-only share.	What debt yield do CMBS lenders want on hotels?
`find_cmbs_lenders`	CMBS originators ranked by securitized volume, filtered by property type, state and loan amount, each with its loan size range, median rate and leverage.	Which CMBS lenders do $12 million retail loans in Texas?
`get_cmbs_lender`	One lender's CMBS book: volume, loan sizes, rates, leverage, property types, states and its most recent securitized loans.	What does Goldman Sachs's CMBS lending look like?
`get_cmbs_maturity_wall`	CMBS loans maturing each year, overall, by type or by state: count, balance, average rate and the share that may not refinance at today's terms.	How many CMBS loans in Florida mature in 2027?
`size_cmbs_loan`	The maximum CMBS loan under the loan to value, debt service coverage and debt yield tests, and which one binds. Limits you leave out default to what recent loans stayed within.	How big a CMBS loan can I get on a $25 million property with $1.8 million of NOI?
`special_servicing_timeline`	The contractual sequence after a missed monthly payment or a missed balloon, each step with its PSA section; give the days elapsed and it says what has been triggered and what comes next.	My CMBS loan is 75 days past due. What has happened and what is next?
`estimate_special_servicing_fees`	Special servicing, workout and liquidation fees for one outcome: corrected, refinanced within 120 days of maturity, or liquidated.	What would the special servicer earn on an $18 million loan that recovers after nine months?
`calculate_appraisal_reduction`	The Appraisal Reduction Amount from a new appraisal, the share of interest the servicer keeps advancing, and the 25% deemed reduction.	My $30 million CMBS loan appraised at $28 million. What is the appraisal reduction?

Discovery file: /.well-known/mcp.json. The same numbers are on the pages: CMBS rates, CMBS lenders, the maturity wall, the CMBS loan calculator, the servicer clock, the fee estimator and the appraisal reduction calculator.

JSON API

Plain HTTPS GET, JSON out, CORS open to every origin, no key. Every response carries asOf, source, a not-a-quote notice and a link to the page with the same figures. Bad parameters return a 400 with a message naming the problem. The full description is at /openapi.json (OpenAPI 3.1).

Endpoint	Parameters	Returns
`/api/v1/rates`	`?type=multifamily`	Median note rates by window, property type, term and month
`/api/v1/underwriting`	`?type=office`	Loan size, LTV, DSCR, debt yield and occupancy medians, last 12 months
`/api/v1/lenders`	`?type=retail&state=TX&min=5000000&max=20000000`	Lenders ranked by 12-month volume, with filters
`/api/v1/lenders/{slug}`	`e.g. /api/v1/lenders/citi`	One lender's book and its recent loans
`/api/v1/maturities`	`?type=hotel or ?state=FL`	The maturity wall by year
`/api/v1/servicers`	`?q=rialto`	Special and master servicers from the trustee reports

Examples

curl https://cmbs.loan/api/v1/rates?type=multifamily
curl "https://cmbs.loan/api/v1/lenders?type=retail&state=TX&min=5000000"
curl https://cmbs.loan/api/v1/lenders/wells-fargo
curl "https://cmbs.loan/api/v1/maturities?state=FL"

Property types: multifamily, retail, office, hotel, self-storage, industrial, mixed-use, mobile-home-park, co-op, healthcare. States: a two-letter code or a name.

Calling the MCP server without a client (JSON-RPC over HTTP POST):

curl -s https://cmbs.loan/mcp -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"size_cmbs_loan","arguments":{"property_value":25000000,"noi":1800000}}}'

License and attribution

The loan data and the servicing agreement come from public SEC filings. When you reuse an answer or an API response, credit "cmbs.loan" with a link to the page it names. Figures are estimates from public filings on loans that have closed, not quotes or offers to lend. cmbs.loan is published by Janover Capital LLC, a commercial mortgage advisor, not a lender, servicer or law firm, and not affiliated with any trust or servicer. See the terms for the API and widgets.

Questions people ask

Is there a cost or an API key?

No. The MCP server and the JSON API are free, read-only and need no key or sign-in. Please cite the cmbs.loan page that comes back with each answer.

Where does the data come from?

Rates, underwriting, lenders and maturities are computed from the loan-level data CMBS trusts file with the SEC (Form ABS-EE and Form 10-D), compiled by cmbs.news; the current file has 19,772 loans across 376 trusts, as of 2026-10-28. Servicing terms come from the BANK5 2025-5YR14 pooling and servicing agreement, filed with the SEC on April 2, 2025.

Is a result a quote?

No. Data results describe loans that have already closed, and servicing results come from one reference agreement; your own loan documents and trust agreement govern. For a quote on a real deal, the answers link to the cmbs.loan financing page.

How fresh is it?

Every response carries its asOf date. The data is rebuilt when cmbs.news processes new monthly filings, and responses may be cached for up to an hour.

Questions or an error: hello@cmbs.loan. Privacy and terms.

Get a CMBS quote

Buying or refinancing stabilized commercial property? Send the deal to Janover Capital LLC and a capital markets advisor will reply within one business day.

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